[SI-LIST] Crystal osciiator not oscillating
- From: "Narayane Manish Shivdas, TLS,Chennai" <manishsn@xxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 22 May 2007 20:14:03 +0530
Hi Gurus,
In newly designed board, I am facing a problem of crystal
oscillator not oscillating. This crystal is placed in between the XTAL
&EXTALpin of the microcontroller. Also the load capacitors of 15pF
populated.
uC has internal inverter. Input and output of the inverter has
1MegaOhm resistor &series resistance of 475E at the output of the inverter.
After so many trials on the boards I found out that there are two
cases in which crystal start oscillating –
1) Lowering the value of the external load capacitors form 15pF to
1pF.
2) By keeping the load capacitance value same as 15pF, a 100K
externalresistor between the XTAL &EXTAL pin of the microcontroller,
population starts oscillations.
What will be the reason because of that crystal is not able to oscillate?
Thanks &Regards,
Manish Narayane
HCL Tech, chennai, India
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